The idea that they would leave an area of the ride to effectively be an audio experience seems a bit cheap really. I think that they should incorporate a new scene in that area, hopefully with some moving physical props.
It most likely was a cost-saving decision, although personally, I don't think it's a bad idea. It could do with better execution, the speakers are currently placed above the riders, for an audio experience it would have been better to have a multitude of speakers in different places so riders can hear Emily 'around' them, mixed in with some physical effects such as air cannons.
It seems like they placed a row of speakers above the track pointing down and left it at that.
I'm not a huge lover of audio experiences, but in the context of Alty Mans, it fits within the narrative and offers a different experience/sensation within the ride. There's still physical theming in that area from Duel so they can either enhance the current experience or more than likely dress up the existing space and get some lighting in place.
Tbf it's always felt like a cheap attraction. Even after the retheme there's no effects in there that are amazing. If it's the best we've got in this country then it shows the standards. The best dark rides in the world are 10 time better than Alton manor so we need to up our game in the UK
There are some great effects in there. The majority of the British public will not be travelling to theme parks around the world aside from Disneyland/Disney World/Universal, they will not be comparing Alty Mans to those parks. Alton Towers have done this on a fairly limited budget, they've replaced entire scenes, created a completely new soundtrack and package, added loads of new physical sets and theming, and added newer technology such as screens, projections, and projection mapping.
I don't really understand what people were expecting. This was always going to be a fairly cheap refurbishment, it's amazing how different they've made the ride. It was never going to be Disney/Universal quality and it didn't have the budget to pull off anything game-changing.